Publication bias plots.

<p><a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0056540#pone-0056540-g003" target="_blank">Figure 3A and 3B</a> show the Begg’s funnel plots of studies included in the meta-analysis for overall survival and recurrence-free survival, respectively. The vertical axis represents log [HR] and the horizontal axis means the standard error of log [HR]. Horizontal line and sloping lines in funnel plot represent summary HR and expected 95% CIs for a given standard error, respectively. Area of each circle represents contribution of the study to the pooled OR.